Improvement in steam-generators



P. 1. MGMAHON,

Steam Generators,

NO. 135,996. Patented Feb.-18,1873

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' PATRICK J. MGMAHON, OF NEW ORLEANS, LOUISIANA.

IMPROVEMENT IN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 135,996, dated February 18, 1873.

To all whom it may concern:

Be it known that I, PATRICK J. MGMAHON, ofv New Orleans, in the parish of Orleans and State of Louisiana, have invented a new and useful Improvement in Steam-Generators, of which the'following is a specification:

This invention relates to a novel and useful improvement in steam-generators, whereby economy in fuel and safety from accident by over pressure are secured; and it consists in a boiler, engine, or piston cylinder, a superheater coil, and water-reservoir, combined and arranged to operate as hereinafter set forth and described.

The accompanying drawing is a vertical section of my entire apparatus.

Similar letters of reference indicate corresponding parts. 7

A represents an ordinary vertical tubular steam-boiler, with a superheater, B, above the upper tube-sheet, through and around which the smoke and gaseous products of combustionpass on their way to the chimney O. D is a tank or reservoir, which is nearly filled with water, asindicated in the drawing. E represents the furnace or fire-box in the base of the boiler A. F represents the boiler-tubes. G is the cylinder of an ordinary steam-engine. In this example of my invention the engine is shown attached to the shell of the boiler; but I do not confine myself to this particular arrangement. H is the steam-dome on the tank or reservoir D. 1 is a steam-pipe leading from the steam-space J of the boiler into the bottom of the reservoir D. The horizontal portion of said pipe I is perforated, and extends nearly or quite the length of the reservoir near the bottom, as seen in the drawing. K is a pipe which leads from the dome H to the superheater B, with which it is connected. L is the pipe which leads the steam from the superheater to the engine. M is the pipe through which the exhaust steam passes from the engine into the chimney O. N is an overflowpipe connecting with the boiler at the surface of the water therein, and discharging into the steam-pipe I. The force-pump is designed to work constantly and keep the water-surface at a uniform level in the boiler. Any surplus is returned to the reservoir by the pipe I by means of the pipe N. l The reservoir is provided with an independent force-pump for its own supply. The water to supply the boiler be condensed. The heat thus generated will 7 'be absorbed by the water, which will soon become heated. As the pressure increases in the boiler it will increase in the reservoir, and the steam generated in the reservoir escapes into the dome H and through the pipe K to the superheater, from whence it is conducted into the engine. The steam-pipe I is alwaysopen, and consequently any great or sudden accumulation of steam in the boiler will be absorbed by the Water in the reservoir.

such heat andpower and act as a balancewheelto equalize the action of the boiler.

From this arrangement it will be seen that a sudden evaporation in the boiler cannot cause a sudden increase of pressure, and also that a. sudden demand for power will not suddenly: reduce the pressure.

This generator with its en gine can be constructed in combination with an ordinary car,

for propelling the same; but I do not confine myself to any particular purpose, as the applications may be various as the use of the=-;j

steam-engine.

Having thus described my invention, I claim.

as new and desire to secure by Letters Patcut- 1. The combination of the boiler A, superheater B, and reservoir D, when constructed and arranged substantially as described.

. 2. The steam-pipe I, perforated at its lower end, when arranged with the boiler A and reservoir D, as shown, and substantially as described.

3. The combination of the boiler A, superheater B, reservoir D, and steam-cylinder G,

arranged as described.

P. J. McMAHON.

Witnesses:

JEREMIAH SMITH, M. E. WILLIAMS.

This large body of water will therefore store up 

